INFINITE's charismatic and slightly buffoonish leader Sunggyu recently met his birthday, and his fellow INFINITE members poured out on Twitter to celebrate his very special day.

"Happy birthday to our nearly 30 cutesy Gyu-nim," Sungyeol posted. "Now that you're old, I have a proposal! Although I am merely an underling, please refrain from being cute ..your generosity knows no bounds."

"Sunggyu hyung~! Happy birthday~???" Sungjong posted. "Leader Gyu who always brings us strength~! I love you~ +_+"

Hoya kept his message short and to the point, simply saying, "Happy birthday to Gyu hyungnim". Dongwoo was more upbeat, posting "??? Gyu birthday ~.~ Let's all live to the max!!! Because our lives will pass hehehe life is a party~!"

In response to all of the well-wishes from his fellow members, Sunggyu replied in kind. "Thank you INFINITE friends!" he posted. "But I will always be your cutesy guiyomi."

Happy birthday to our leader, 'grandpa' Gyu!